The River of Five Colors: Cano Cristales, Colombia
The river can be found in the Serrania de la Macarena in the province of Meta. It runs to the east, flowing into the Guayabero river. It is approximately 100km long and no more than 20 meters wide. The phenomenon can be observed during for a special period of a few weeks from June through to November when the temperature is just right. During the short span between the wet and dry season, when the water level is just right, a unique species of plant that lines the river floor called Macarenia clavigera turns a brilliant red. It is offset by splotches of yellow and green sand, blue water, and countless shades in between.
Photo 1: Ma Fee, Photo 2: Sebastian Matyuck, source